Outsourcing Options
Aug 1, 2006, By Beck Ireland, Staff Writer
For the last few years, has been the buzzword in the plant maintenance world, and the numbers prove it. In 2004, consulting firm D.F. Blumberg Associates,...
Legally Required and Optional Standby Systems
Aug 1, 2006, By Mike Holt, NEC Consultant
Emergency power systems (Art. 700) are at the top of the hierarchy of backup power systems. Legally required standby systems, which fall under Art. 701,...
Illustrated Catastrophes
Aug 1, 2006, By Joe Tedesco, NEC Columnist
As usual, never consider the following commentary associated with these photos as a formal interpretation of the National Electrical Code (NEC). Without...
Stumped by the Code?
Aug 1, 2006, By Mike Holt, NEC Consultant
Q. Can 277V circuit conductors be placed within the same raceway with 120V circuit conductors?...
Code Quiz
Jul 25, 2006, By Steven Owen
What is the minimum size NM cable required for an electric space-heating branch circuit installed 3 inches above a heated ceiling (with no thermal insulation) in a dwelling unit?...
Code Q&A
Jul 25, 2006, By Mike Holt
Q. Is liquidtight flexible metal conduit (LFMC) permitted under the raised floor of a computer room? If yes, must it be secured?...
Code Quiz
Jul 11, 2006, By Steven Owen
When installing electric heat-tracing cables and heating panels in industrial installations (where ground fault alarm indication is provided and the operation cannot tolerate a ground fault condition that would normally open the circuit overcurrent device)...
Code Q&A
Jul 11, 2006, By Mike Holt
Q. Can Table 310.15(B)(6) be used to size service conductors for a duplex?...
Stumped by the Code?
Jul 1, 2006, By Mike Holt, NEC Consultant
Q. Is GFCI protection required for a single-phase, 208V, 30A coffee maker receptacle in a commercial kitchen?...
Illustrated Catastrophes
Jul 1, 2006, By Joe Tedesco, NEC Columnist
As usual, never consider the following commentary associated with these photos as a formal interpretation of the National Electrical Code (NEC). Without...
Code Quiz
Jun 20, 2006, By Steven Owen
What is the minimum acceptable voltage at a fire pump motor’s terminals, when the 460V-rated motor is supplied with an operating voltage of 480V, and the motor is operating at 115% of the full-load current rating of the motor?...
Code Q&A
Jun 20, 2006, By Mike Holt
Q. When determining the placement for receptacles in a dwelling, is the wall space behind a door required to be considered?...
Code Violations Illustrated
Jun 12, 2006,
Code Q&A
Jun 12, 2006, By Mike Holt
Q. Am I required to install the secondary circuit conductors of a low-voltage lighting system (less than 30V) in a raceway or cable like power conductors?...
Code Quiz
Jun 12, 2006, By Steven Owen
When installing wiring from a fire pump controller to a fire pump motor, which of the following wiring methods is not permitted?...
Article 700: Emergency Systems
Jun 1, 2006, By Mike Holt, NEC Consultant
Essentially, emergency systems are lifelines for people, and Art. 700 is all about keeping those lifelines from breaking. The Article's main goal is to...
Illustrated Catastrophes
Jun 1, 2006, By Joe Tedesco, NEC Columnist
As usual, never consider the following commentary associated with these photos as a formal interpretation of the National Electrical Code (NEC). Without...
Code Quiz
May 24, 2006, By Steven Owen
An existing corporate data center is concerned about possible loss of power due to the fact that it is supplied by only one service. The existing feed consists of a 1600A, 208Y/120V, 3-phase, four-wire service. Data center management personnel propose to add an additional service....
Code Q&A
May 24, 2006, By Mike Holt
Q. Does the NEC specifically state that a generator must be grounded to the earth if its wiring is connected to the premises via a transfer switch that does not open the neutral?...
Code Quiz
May 11, 2006, By Steven Owen
According to 110.16, certain information is required on the label when marking switchboards, panelboards, industrial control panels, meter socket enclosures, and motor control centers....
